Sanding drums and mandrels worked well for my Dremel 396 The quality is the same as all mentioned Dremel products I've bought over the years. To be honest, I consider these sanding rollers to be a tool for easy and quick sanding in the hobby or for repairs. I'm not judging them by their lifespan or toughness because I don't use them for heavy work. When I need this type of sanding or sanding, I use my heavy duty belt sanders and grinders. For the price I think this deal was very good and the quality of the drums is as good as it gets and I give the product 5 stars.